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US 8,631,598 B2Granted
Light emitting sign and display surface therefor
AssigneeIntematix Corporation
InventorsYi-Qun Li, Yi Dong, James Caruso, Charles Edwards
Life of this patent
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Abstract
A light emitting sign comprising a plurality of blue LEDs operable to generate blue excitation light and a light emitting display surface comprising a light transmissive substrate and at least one phosphor overlaying at least a portion of one face of the substrate. The phosphor is configured to absorb at least a portion of the blue light generated by the LEDs and, in response, to emit light of a selected color other than blue. Regions of the display surface intended to generate blue light do not include the phosphor.
Claims13
A light emitting sign comprising:
- a plurality of blue LEDs operable to generate blue excitation light and a light emitting display surface comprising a light transmissive substrate and at least one phosphor overlaying at least a portion of one face of the substrate,
- wherein the phosphor is configured to absorb at least a portion of the blue light generated by the LEDs and, in response, to emit light of a selected color;
- and
- a reflective color enhancement layer overlaying the phosphor, wherein the reflective color enhancement layer is configured to reflect wavelengths of light from sunlight corresponding to light produced by emissions of the blue LEDs and the phosphor, and to substantially absorb other wavelengths of the light from the sunlight.
1 more element
Dependencies are inferred from the claim text.